When Barnes & Noble first announced its latest e-reader, the Nook Simple Touch With GlowLight, the company indicated it would ship the e-reader in early May. Well, scratch that--the company began shipping the GlowLight e-reader this week to pre-orders. The e-reader is still expected to be for sale in stores starting in early May.

But don't assume you'll be able to walk right into your local Barnes & Noble book store to buy one. Barnes & Noble sent us an alert warning of "very strong" pre-order demand that was "larger-than-expected." That, the company says, will translate into limited quantities of the Nook Simple Touch With GlowLight when it arrives on store shelves in May.

Barnes & Noble recommends you pre-order the device now if you're determined to get the Nook Simple Touch With GlowLight in time for a Mother's Day gift.